Java中常用的類及常用方法的一些例項
阿新 • • 發佈：2019-02-16
package shiyan6;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
public class Test6
{
public static void main(String[] args)
{
// TODO Auto-generated method stub
Map<String,String>map= new HashMap<String,String>();
map.put("姓名", "小胡");
map.put("性別", "男");
map.put("年齡", "13");
System.out.println("大小:"+map.size());
Set<String>set=map.keySet();
Iterator<String>it=set.iterator();
while(it.hasNext())
{
String key=it.next();
String value=map.get(key);
//System.out.println("key:"+key+"\t"+"value:"+value);
if(key.equals("年齡"))
{
System.out.println("年齡:"+value);
}
}
System.out.println(map.containsKey("愛好"));
}
}
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
public class Test6
{
public static void main(String[] args)
{
// TODO Auto-generated method stub
Map<String,String>map= new HashMap<String,String>();
map.put("姓名", "小胡");
map.put("性別", "男");
map.put("年齡", "13");
System.out.println("大小:"+map.size());
Set<String>set=map.keySet();
Iterator<String>it=set.iterator();
while(it.hasNext())
{
String key=it.next();
String value=map.get(key);
//System.out.println("key:"+key+"\t"+"value:"+value);
if(key.equals("年齡"))
{
System.out.println("年齡:"+value);
}
}
System.out.println(map.containsKey("愛好"));
}
}